package com.LostAndFound.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginFilter implements Filter{
	@Override
	public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) resp;
		HttpSession session = request.getSession();
		//过滤，用户还没登录，重定向到登录界面
		if(session.getAttribute("root")==null){
			response.sendRedirect(request.getContextPath()+"/default.jsp");
			return;
		}
		else{
			chain.doFilter(request, response);
		}
	}
	
	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}


	@Override
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		
	}
}